Smoke dust secondary remelting device for waste heat recovery of oxygen-enriched side-blown converter

Abstract

The invention relates to the field of oxygen-enriched side-blown furnaces, in particular to a smoke secondary remelting device for waste heat recovery of an oxygen-enriched side-blown furnace, which is used for solving the problem that energy conservation and emission reduction are not facilitated due to increase of tail gas pollutants and fuel consumption caused by lack of recovery of incompletely combusted smoke during waste heat recovery. A tail gas channel is divided into a smoke dust recovery sub-pipeline and a preheating recovery sub-pipeline, fuel which is not completely combusted is intercepted and returns to a furnace body again to be combusted under the action of airflow, heat energy recovery is achieved for high-heat tail gas through a heat exchanger, and when the tail gas smoke dust is shunted through a smoke dust baffle, analysis is conducted through air pressure parameters, so that the smoke dust recovery efficiency is improved. When combustible smoke particles are recycled, normal fuel combustion in the furnace body is guaranteed by adjusting the air inlet amount of the air inlet, and therefore secondary recycling of the smoke waste heat of the tail gas of the oxygen-enriched side-blown furnace is achieved.

Description

Technical Field

[0001] The present invention relates to the field of oxygen-enriched side-blowing furnaces, and specifically to a device for secondary recycling of soot for waste heat recovery of an oxygen-enriched side-blowing furnace. Background Art

[0002] The oxygen-enriched side-blowing furnace is a metallurgical device. As an energy-saving and efficient smelting furnace, it has been widely used in the smelting of copper, nickel, lead, and tin. It is characterized by small gas consumption, small equipment size, small floor area, strong material adaptability, low waste gas emissions, and high metal recovery rate. It adopts the side-blowing method to inject oxygen-enriched gas on the side of the furnace charge, and improves the smelting efficiency through high-temperature oxidation reaction; during the production process, a large amount of high-temperature flue gas is generated by the reaction of the materials in the furnace body. In order to recover and utilize the heat in these high-temperature flue gases, a waste heat recovery device for recovering the waste heat of the flue gas is added to the furnace body in the prior art;

[0003] Currently, a technical solution is disclosed in the existing patent CN118582971A. In this solution, the heat conduction efficiency of the heat exchanger is obtained, the use effect of the heat exchange tubes is analyzed according to the heat conduction efficiency, and the heat exchange tubes are cleaned by the driving module and the scraper to ensure the use efficiency of the heat exchanger. However, in the heat exchanger, in order to ensure the heat exchange efficiency, the heat exchange tubes are all thin and weak capillary tubes. Therefore, when scraping the heat exchange tubes, it is easy to damage the heat exchange tubes. At the same time, the reason for the attachment outside the heat exchange tubes is the soot particles that are not completely burned in the tail gas. Therefore, if the soot particles are not recovered, it will cause environmental pollution and make the fuel combustion incomplete, thereby increasing the fuel consumption;

[0004] In view of the above technical problems, the present application proposes a solution. Summary of the Invention

[0005] The present invention divides the tail gas channel into two groups of sub-pipes for soot recovery and preheating recovery, thereby intercepting the unburned fuel and returning it to the furnace body for combustion under the action of the air flow. For the high-temperature tail gas without soot or with low soot content, the waste heat of the tail gas is recovered through the heat exchanger, thereby realizing the secondary recovery and utilization of the waste heat of the flue gas of the oxygen-enriched side-blowing furnace tail gas, ensuring the combustion sufficiency of the fuel, and reducing the frequency of maintenance and cleaning of the heat exchanger attached by soot during waste heat recovery, solving the problem that there is no recovery of the unburned soot during waste heat recovery, resulting in an increase in tail gas pollutants and an increase in fuel consumption, which is not conducive to energy conservation and emission reduction, and proposes a device for secondary recycling of soot for waste heat recovery of an oxygen-enriched side-blowing furnace.

[0006] The object of the present invention can be achieved by the following technical solutions:

[0007] A dust secondary recycling device for waste heat recovery of an oxygen-enriched side-blown furnace, comprising a furnace body. An air inlet is provided on one side of the bottom of the furnace body, and a tail gas channel is fixedly installed on the top of the furnace body;

[0008] The end of the tail gas channel is connected to a waste heat recovery channel, the end of the waste heat recovery channel is connected to a heat exchanger. A cold water inlet and a hot water drain are arranged on one side of the heat exchanger. The heat exchanger internally has a plurality of capillary heat exchange pipes. One group of the capillary heat exchange pipes is connected to the waste heat recovery channel, and the other group is connected to the cold water inlet and the hot water drain;

[0009] A dust recovery channel is connected below the horizontal section of the waste heat recovery channel. The dust recovery channel is inclined. The end of the dust recovery channel re-enters the bottom of the furnace body. A dust baffle is installed at the intersection of the waste heat recovery channel and the dust recovery channel. The dust baffle is inclined, and fine sieve holes are arranged on the dust baffle.

[0010] As a preferred embodiment of the present invention, it further includes a dust secondary recycling control system. The dust secondary recycling control system includes a recycling detection unit, a heat exchange detection unit, an air flow branch control unit, and an oxygen-enriched inlet control unit;

[0011] The recycling detection unit and the oxygen-enriched inlet control unit are used to detect the gas flow rate in the dust recovery channel and control the gas flow rate in the air inlet according to the gas flow rate in the dust recovery channel;

[0012] The air flow branch control unit analyzes the air pressure parameters in the waste heat recovery channel, the dust recovery channel, and the tail gas channel, and confirms the working state of the dust baffle;

[0013] The heat exchange detection unit detects the heat exchange parameters of the heat exchanger and confirms the working state of the heat exchanger in combination with the detection results of the air flow branch control unit.

[0014] As a preferred embodiment of the present invention, the recycling detection unit counts the gas flow rate in the dust recovery channel and records it as CV. At the same time, the oxygen content O of the gas entering the furnace body is obtained through the oxygen-enriched inlet control unit, and the oxygen-enriched gas flow rate OV is generated through formula analysis, where Q is a preset oxygen demand coefficient, and the oxygen-enriched inlet control unit controls the gas flow rate entering the furnace body through the oxygen-enriched gas flow rate OC.

[0015] As a preferred embodiment of the present invention, the air flow branch control unit records the pressure in the tail gas channel as the total pressure, the pressure in the waste heat recovery channel as the waste heat pressure, and the pressure in the dust recovery channel as the dust pressure;

[0016] The air flow manifold control unit draws a rectangular coordinate system with time as the horizontal axis and pressure as the vertical axis, and plots the total pressure change curve, the waste heat pressure change curve, and the soot pressure change curve of the total pressure, waste heat pressure, and soot pressure collected multiple times in the rectangular coordinate system.

[0017] As a preferred embodiment of the present invention, the air flow manifold control unit obtains the difference between each set of peaks and valleys of the total pressure change curve, records it as the fluctuation amplitude, and performs arithmetic averaging on the fluctuation amplitude to obtain the average fluctuation amplitude BD;

[0018] The air flow manifold control unit records the time interval between the occurrences of adjacent two sets of peaks as the peak interval, and performs arithmetic averaging on the peak interval to obtain the average peak interval TD;

[0019] The time interval between the occurrences of adjacent two sets of valleys is recorded as the valley interval td, and arithmetic averaging is performed on the valley interval to obtain the average valley interval;

[0020] The air flow manifold control unit performs formula analysis through the average fluctuation amplitude, the average peak interval, and the average valley interval to obtain the total pressure change amplitude.

[0021] As a preferred embodiment of the present invention, the air flow manifold control unit collects the valley occurrence intervals of the waste heat pressure change curve, and performs arithmetic averaging on the collected valley occurrence intervals to obtain the average valley interval. The peak occurrence intervals of the flue gas pressure change curve are collected, and arithmetic averaging is performed on the collected peak occurrence intervals to obtain the average peak interval. The air flow manifold control unit calculates the average peak interval and the average valley interval to obtain the pressure interval difference Pt;

[0022] The air flow manifold control unit selects the highest point on the flue gas pressure fluctuation curve, and obtains the time point T1 corresponding to the highest point of the flue gas pressure fluctuation curve. The air flow manifold control unit obtains a time range through T1±Pt, and the air flow manifold control unit selects the lowest pressure point of the waste heat pressure change curve within the time range, and calculates the pressure difference between the highest point of the flue gas pressure fluctuation curve and the lowest pressure point of the waste heat pressure change curve;

[0023] If the pressure difference is less than the corresponding pressure threshold, a baffle normal signal is generated. If the pressure difference is greater than the corresponding pressure threshold, a baffle blockage signal is generated.

[0024] As a preferred embodiment of the present invention, the heat exchange detection unit detects the temperatures of the cold water inlet and the hot water drain of the heat exchanger, obtains the temperature difference, obtains the air flow temperature inside the tail gas passage, and calculates the ratio of the temperature difference and the air flow temperature to obtain the heat exchange ratio. If the heat exchange ratio is not greater than the preset ratio threshold, a heat exchange abnormal signal is generated.

[0025] As a preferred embodiment of the present invention, after the heat exchange detection unit generates a heat exchange abnormal signal, if the air flow manifold control unit simultaneously generates a baffle blockage signal, the heat exchange abnormal signal is maintained. If the air flow manifold control unit simultaneously generates a baffle normal signal when the heat exchange detection unit generates a heat exchange abnormal signal, a heat exchange equipment failure signal is generated.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. In the present invention, during the operation of the oxygen-enriched side-blowing furnace, the tail gas passage is divided into two groups of sub-pipes for dust recovery and waste heat recovery, so as to intercept the unburned fuel and return it to the furnace body for combustion under the action of air flow. For the high-temperature tail gas without dust or with low dust content, the heat energy of the tail gas is recovered through the heat exchanger, thus realizing the secondary recovery and utilization of the flue gas waste heat of the oxygen-enriched side-blowing furnace tail gas, ensuring the sufficient combustion of the fuel and reducing the frequency of maintenance and cleaning of the heat exchanger due to dust adhesion during waste heat recovery.

[0028] 2. In the present invention, when the dust baffle diverts the tail gas dust, by analyzing the pressure parameters in the dust recovery channel and the tail gas recovery channel, the simulation and prediction of the use state of the dust baffle are realized, and when the prediction result of the dust baffle is blocked, a signal is generated for reminder, so as to ensure the normal operation of the dust baffle.

[0029] 3. In the present invention, the gas flow rate of the dust recovery channel is collected, and the oxygen content in the dust recovery channel and the oxygen-enriched gas inlet is calculated to obtain the intake air volume required to ensure the fuel combustion in the furnace under the influence of the recovered air flow, so as not to affect the normal fuel combustion operation in the furnace when the combustible dust particles are recovered. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0031] Figure 1 is the front view structural schematic diagram of the present invention;

[0032] Figure 2 is the sectional view structural schematic diagram of the present invention;

[0033] Figure 3 is the system block diagram of the present invention;

[0034] Figure 4 is the system flow chart of the present invention.

[0035] In the figure: 1, furnace body; 2, air inlet; 3, tail gas passage; 4, waste heat recovery passage; 5, soot recovery passage; 6, heat exchanger; 7, cold water inlet; 8, hot water drain; 9, soot baffle. Specific embodiments

[0036] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative work shall fall within the protection scope of the present invention.

[0037] Embodiment 1:

[0038] Please refer to Figure 1 - Figure 4 As shown, a device for secondary recycling of soot for waste heat recovery of an oxygen-enriched side-blowing furnace includes a furnace body 1. An air inlet 2 is provided on one side of the bottom of the furnace body 1. The air inlet 2 is used to blow oxygen-enriched gas into the furnace body 1. The fuel in the furnace burns for heating by blowing in the oxygen-enriched gas. A tail gas passage 3 is fixedly installed at the top of the furnace body 1;

[0039] Among them, the tail gas passage 3 extends outward. A waste heat recovery passage 4 is connected to the end of the tail gas passage 3. A heat exchanger 6 is connected to the end of the waste heat recovery passage 4. A cold water inlet 7 and a hot water drain 8 are provided on one side of the heat exchanger 6. The hot water drain 8 is located above the cold water inlet 7. The heat exchanger 6 has a plurality of capillary heat exchange pipes inside. One group of the capillary heat exchange pipes is connected to the waste heat recovery passage 4 to form a structure of tail gas passage → capillary heat exchange pipe → exhaust port, and the other group is connected to the cold water inlet 7 and the hot water drain 8 to form a structure of cold water inlet 7 → capillary heat exchange pipe → hot water drain 8;

[0040] A soot recovery passage 5 is connected below the horizontal section of the waste heat recovery passage 4. The soot recovery passage 5 is inclined. The end of the soot recovery passage 5 re-enters the bottom of the furnace body 1, so that the completely burned soot discharged from the tail gas passage 3 re-enters the furnace body 1 for combustion again, thereby ensuring the complete combustion degree during fuel combustion, reducing the fuel consumption and at the same time reducing the soot emission. A soot baffle 9 is installed at the intersection of the waste heat recovery passage 4 and the soot recovery passage 5. The soot baffle 9 is inclined. Fine sieve holes are provided on the soot baffle 9 to block the outflow of incompletely burned particles. The purpose of setting the soot baffle 9 as an inclined structure is that when the soot accumulated on the soot baffle 9 continuously accumulates and blocks the airflow passing through the soot baffle 9, the airflow flowing along the inclination of the soot baffle 9 will drive the soot on the soot baffle 9 to fall off, thereby reducing the possibility of blockage of the soot baffle 9 and the cleaning frequency.

[0041] Embodiment 2:

[0042] Please refer to Figure 1 - Figure 4 As shown, a secondary furnace return device for waste heat recovery of an oxygen-enriched side-blown furnace further includes a secondary furnace return control system for soot. This system is equipped with sensors in the tail gas passage 3, the waste heat recovery passage 4, and the soot recovery passage 5. A secondary furnace return control system for soot includes a return furnace detection unit, a heat exchange detection unit, an air flow branch control unit, and an oxygen-enriched inlet control unit;

[0043] The air flow branch control unit is respectively provided with two groups of pressure sensors on both sides of the soot baffle 9. The pressure inside the tail gas passage 3, the waste heat recovery passage 4, and the soot recovery passage 4 is collected through the pressure sensors. The air flow branch control unit records the pressure in the tail gas passage 3 as the total pressure, the pressure in the waste heat recovery passage 4 as the waste heat pressure, and the pressure in the soot recovery passage 5 as the soot pressure;

[0044] During the operation of the air flow branch control unit, the total pressure, waste heat pressure, and soot pressure are collected multiple times. The air flow branch control unit uses time as the horizontal axis and pressure as the vertical axis to draw a plane rectangular coordinate system, and draws a total pressure change curve according to the change of the total pressure, a waste heat pressure change curve according to the change of the waste heat pressure, and a soot pressure change curve according to the change of the soot pressure in the plane rectangular coordinate system;

[0045] The air flow branch control unit collects each group of peaks and valleys of the total pressure change curve, calculates the difference between each group of peaks and valleys, and records it as the fluctuation amplitude. The air flow branch control unit performs arithmetic averaging on the fluctuation amplitude to obtain the fluctuation amplitude mean value BD. The air flow branch control unit records the time interval between the appearance of adjacent two groups of peaks as the peak interval, performs arithmetic averaging on the peak interval to obtain the peak interval mean value TD, records the time interval between the appearance of adjacent two groups of valleys as the valley interval td, and performs arithmetic averaging on the valley interval to obtain the valley interval mean value. The air flow branch control unit performs formula analysis through the fluctuation amplitude mean value, peak interval mean value, and valley interval mean value to obtain the total pressure change amplitude APD, where q is a preset weight coefficient, and q is greater than 1;

[0046] The air flow branch control unit collects the valley appearance intervals of the waste heat pressure change curve and performs arithmetic averaging on the collected valley appearance intervals to obtain the valley interval mean value. The air flow branch control unit collects the peak appearance intervals of the flue gas pressure change curve and performs arithmetic averaging on the collected peak appearance intervals to obtain the peak interval mean value. The air flow branch control unit calculates the peak interval mean value and the valley interval mean value to obtain the pressure interval difference Pt;

[0047] The air flow manifold control unit selects the highest point on the flue gas pressure fluctuation curve and obtains the time point T1 corresponding to the highest point of the flue gas pressure fluctuation curve. The air flow manifold control unit obtains a time range through T1±Pt. The air flow manifold control unit selects the lowest pressure point of the waste heat pressure change curve within the time range T1±Pt, calculates the pressure difference between the highest point of the flue gas pressure fluctuation curve and the lowest pressure point of the obtained waste heat pressure change curve, and compares the pressure difference with the corresponding pressure threshold. If the pressure difference is less than the corresponding pressure threshold, a baffle normal signal is generated. If the pressure difference is greater than the corresponding pressure threshold, a baffle blockage signal is generated. The air flow manifold control unit sends the baffle blockage signal or the baffle normal signal to the display device through the network and generates an audible and visual alarm simultaneously when the baffle blockage signal is displayed.

[0048] Embodiment 3:

[0049] Please refer to Figure 1 - Figure 4 As shown, the heat exchange detection unit obtains the air flow temperature inside the tail gas passage 3 through a sensor, and at the same time detects the temperatures of the cold water inlet 7 and the hot water drain outlet 8 of the heat exchanger 6 to obtain a temperature difference. The heat exchange monitoring unit calculates the ratio of the temperature difference to the air flow temperature to obtain a heat exchange ratio, and compares the heat exchange ratio with a preset ratio threshold. If the heat exchange ratio is greater than the preset ratio threshold, a heat exchange normal signal is generated. If the heat exchange ratio is not greater than the preset ratio threshold, a heat exchange abnormal signal is generated;

[0050] After the heat exchange detection unit generates a heat exchange abnormal signal, if the air flow manifold control unit simultaneously generates a baffle blockage signal, the heat exchange abnormal signal is maintained. If the heat exchange detection unit generates a heat exchange abnormal signal and the air flow manifold control unit simultaneously generates a baffle normal signal, a heat exchange equipment failure signal is generated;

[0051] The heat exchange detection unit sends the generated heat exchange equipment failure signal or heat exchange abnormal signal to the display device through the network for display through the display device.

[0052] Embodiment 4:

[0053] Please refer to Figure 1 - Figure 4 As shown, the recirculation detection unit counts the gas flow rate in the dust recovery passage 5 and records it as CV. At the same time, the oxygen content O of the gas entering the furnace body 1 is obtained through the oxygen-enriched inlet control unit, and the oxygen-enriched gas flow rate OV is generated through formula analysis, where Q is a preset oxygen demand coefficient, and the oxygen-enriched inlet control unit controls the gas flow rate entering the furnace body 1 through the oxygen-enriched gas flow rate OC.

[0054] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only the specific embodiments. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A secondary dust recycling device for waste heat recovery of an oxygen-enriched side-blown furnace, characterized in that: It comprises a furnace body (1), an air inlet (2) is provided on one side of the bottom of the furnace body (1), and an exhaust gas passage (3) is fixedly installed on the top of the furnace body (1); The end of the tail gas channel (3) is connected to a waste heat recovery channel (4), and the end of the waste heat recovery channel (4) is connected to a heat exchanger (6). A cold water inlet (7) and a hot water outlet (8) are provided on one side of the heat exchanger (6). The heat exchanger (6) has a plurality of capillary heat exchange pipes inside, one group of the capillary heat exchange pipes is connected to the waste heat recovery channel (4), and the other group is connected to the cold water inlet (7) and the hot water outlet (8); A smoke recovery channel (5) is connected below the horizontal section of the waste heat recovery channel (4); the smoke recovery channel (5) is inclined, and the end of the smoke recovery channel (5) re-enters the bottom of the furnace body (1); a smoke baffle (9) is installed at the intersection of the waste heat recovery channel (4) and the smoke recovery channel (5); the smoke baffle (9) is inclined, and fine mesh is arranged on the smoke baffle (9).

2. The device for secondary recycling of smoke dust for waste heat recovery of an oxygen-enriched side-blown furnace according to claim 1 is characterized in that: The invention also includes a secondary recycling control system for smoke dust, which includes a recycling detection unit, a heat exchange detection unit, an airflow branch control unit and an oxygen-enriched inlet control unit; The furnace recycle detection unit and the oxygen-enriched inlet control unit are used to detect the gas flow in the smoke recovery channel (5), and control the gas flow in the air inlet (2) according to the gas flow in the smoke recovery channel (5); The airflow branch control unit obtains air pressure parameters in the waste heat recovery channel (4), the smoke recovery channel (5) and the exhaust channel (3), and analyzes the air pressure parameters to confirm the working state of the smoke baffle (9); The heat exchange detection unit detects the heat exchange parameters of the heat exchanger (6), and confirms the working state of the heat exchanger (6) in combination with the detection result of the airflow branch control unit.

3. The device for secondary recycling of smoke dust for waste heat recovery of an oxygen-enriched side-blown furnace according to claim 1 is characterized in that: The furnace return detection unit counts the gas flow in the smoke recovery channel (5) and records it as CV. At the same time, the oxygen content O of the gas entering the furnace body (1) is obtained through the oxygen-enriched inlet control unit, and the oxygen-enriched gas flow OV is generated through formula analysis. Wherein Q is a preset oxygen demand coefficient, and the oxygen-enriched inlet control unit controls the gas flow rate entering the furnace body (1) through the oxygen-enriched gas flow rate OC.

4. The device for secondary recycling of smoke dust for waste heat recovery of an oxygen-enriched side-blown furnace according to claim 3 is characterized in that: The air flow branch control unit records the pressure in the exhaust gas channel (3) as the total pressure, the pressure in the waste heat recovery channel (4) as the waste heat pressure, and the pressure in the smoke recovery channel (5) as the smoke pressure; The airflow branch control unit draws a plane rectangular coordinate system with time as the horizontal axis and pressure as the vertical axis, and draws a total pressure change curve, a residual heat pressure change curve and a smoke pressure change curve in the plane rectangular coordinate system based on the total pressure, residual heat pressure and smoke pressure collected multiple times.

5. The device for secondary recycling of smoke dust for waste heat recovery of an oxygen-enriched side-blown furnace according to claim 1 is characterized in that: The airflow branch control unit obtains the difference between each group of peaks and troughs of the total pressure change curve, records it as the fluctuation amplitude, and performs arithmetic averaging on the fluctuation amplitude to obtain the fluctuation amplitude mean BD; The airflow branch path control unit records the time interval between two adjacent groups of wave peaks as the wave peak interval, and performs arithmetic averaging on the wave peak interval to obtain the wave peak interval mean value TD; The time interval between two adjacent groups of troughs is recorded as the trough interval td, and the trough intervals are arithmetic averaged to obtain the trough interval mean; The airflow branch control unit performs formula analysis through the mean value of the fluctuation amplitude, the mean value of the peak interval and the mean value of the trough interval to obtain the total pressure fluctuation amplitude.

6. The device for secondary recycling of smoke dust for waste heat recovery of an oxygen-enriched side-blown furnace according to claim 1 is characterized in that: The airflow branch control unit collects the trough intervals of the waste heat pressure variation curve, and performs arithmetic averaging on the collected trough intervals to obtain a trough interval mean value, collects the peak intervals of the flue gas pressure variation curve, and performs arithmetic averaging on the collected peak intervals to obtain a peak interval mean value, and the airflow branch control unit calculates the peak interval mean value and the trough interval mean value to obtain a pressure interval difference Pt; The airflow branch control unit selects the highest point on the flue gas pressure fluctuation curve, and obtains the time point T1 corresponding to the highest point of the flue gas pressure fluctuation curve. The airflow branch control unit obtains the time range through T1±Pt. The airflow branch control unit selects the lowest pressure point of the waste heat pressure change curve in the time range, and calculates the pressure difference between the highest point of the flue gas pressure fluctuation curve and the lowest pressure point of the waste heat pressure change curve. If the pressure difference is less than the corresponding pressure threshold, a baffle normal signal is generated, and if the pressure difference is greater than the corresponding pressure threshold, a baffle blocked signal is generated.

7. The device for secondary recycling of smoke dust for waste heat recovery of an oxygen-enriched side-blown furnace according to claim 4 is characterized in that: The heat exchange detection unit detects the temperature of the cold water inlet (7) and the hot water outlet (8) of the heat exchanger (6), obtains the temperature difference, obtains the air flow temperature inside the exhaust gas channel (3), calculates the ratio of the temperature difference and the air flow temperature, and obtains the heat exchange ratio. If the heat exchange ratio is not greater than a preset ratio threshold, a heat exchange abnormality signal is generated.

8. The device for secondary recycling of smoke dust for waste heat recovery of an oxygen-enriched side-blown furnace according to claim 7 is characterized in that: After the heat exchange detection unit generates a heat exchange abnormality signal, if the airflow branch path control unit simultaneously generates a baffle blockage signal, the heat exchange abnormality signal is maintained; if the airflow branch path control unit simultaneously generates a baffle normal signal when the heat exchange detection unit generates a heat exchange abnormality signal, a heat exchange equipment fault signal is generated.

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